Definitely having someone scratch my back!!! Especially those 'hard to reach' areas. Nothing like a woman's long fingernails to spoil me by scratching my itch.....
Having someone else scratch it. It is a simple joy that can only be had when someone cares enough to do it for you. I'm waiting on a little back-scratching robot. There actually was one a few years ago but it's disappeared. I guess it didn't work very well.